Question

1. Briefly explain how transpiration helps plants transport water, including the direction of flow and the names of the tissues or structures involved. (2 points) 2. Root hairs are not true roots, but are extensions of the dermal tissue that _. (1 point) A. increase surface area for water absorption B. insulate the roots against rapid temperature changes C. protect the plant from damage by entangling would-be herbivores D. store starch which provides energy reserves for the plant E. allow the plant to perform light-independent photosynthesis reactions underground 3. Water movement in stems depends on both cohesion and adhesion of water molecules within the xylem's water column. With this in mind, briefly explain why cut flowers can be kept fresher if their stems are initially cut while submerged in water. (2 points) 4. Observe the transpirometer apparatus (on p. 179) which can quantify the rate of transpiration (= volume of water / time) performed by a cut stem. If you wanted to increase this rate without altering the plant or the apparatus, what is one thing you could change about the environment and why might it work? (2 points). 5. Water transport in plants is governed by water potential (the free energy of water). In plants, water potential is actually a combination of _. (1 point). A. turgor pressure and plant diameter B. solute concentration and plant height C. stomatal density and soil porosity D. solute concentration and soil permeability E. turgor pressure and solute concentration 6. Stomata function in both water movement and gas exchange. Currently on Earth, both the atmospheric carbon dioxide level and average surface temperature are increasing. As plants continue to evolve in this environment, how do you think the density of stomata (= number of stomata / unit of leaf area) might be affected over time, and why? This is a hypothetical question with more than one possible answer. (2 points).

1. Briefly explain how transpiration helps plants transport water, including the direction of flow and the names of the tissues or structures involved. (2 points)

2. Root hairs are not true roots, but are extensions of the dermal tissue that _______. (1 point)
A. increase surface area for water absorption
B. insulate the roots against rapid temperature changes
C. protect the plant from damage by entangling would-be herbivores
D. store starch which provides energy reserves for the plant
E. allow the plant to perform light-independent photosynthesis reactions underground

3. Water movement in stems depends on both cohesion and adhesion of water molecules within the xylem's water column. With this in mind, briefly explain why cut flowers can be kept fresher if their stems are initially cut while submerged in water. (2 points)

4. Observe the transpirometer apparatus (on p. 179) which can quantify the rate of transpiration (=
volume of water / time) performed by a cut stem. If you wanted to increase this rate without
altering the plant or the apparatus, what is one thing you could change about the environment and
why might it work? (2 points).

5. Water transport in plants is governed by water potential (the free energy of water). In plants,
water potential is actually a combination of _______. (1 point).
A. turgor pressure and plant diameter
B. solute concentration and plant height
C. stomatal density and soil porosity
D. solute concentration and soil permeability
E. turgor pressure and solute concentration

6. Stomata function in both water movement and gas exchange. Currently on Earth, both the
atmospheric carbon dioxide level and average surface temperature are increasing. As plants
continue to evolve in this environment, how do you think the density of stomata (= number of
stomata / unit of leaf area) might be affected over time, and why? This is a hypothetical question
with more than one possible answer. (2 points).

1. Briefly explain how transpiration helps plants transport water, including the direction of flow and the names of the tissues or structures involved. (2 points)

2. Root hairs are not true roots, but are extensions of the dermal tissue that . (1 point)
A. increase surface area for water absorption
B. insulate the roots against rapid temperature changes
C. protect the plant from damage by entangling would-be herbivores
D. store starch which provides energy reserves for the plant
E. allow the plant to perform light-independent photosynthesis reactions underground

3. Water movement in stems depends on both cohesion and adhesion of water molecules within the xylem's water column. With this in mind, briefly explain why cut flowers can be kept fresher if their stems are initially cut while submerged in water. (2 points)

4. Observe the transpirometer apparatus (on p. 179) which can quantify the rate of transpiration (=
volume of water / time) performed by a cut stem. If you wanted to increase this rate without
altering the plant or the apparatus, what is one thing you could change about the environment and
why might it work? (2 points).

5. Water transport in plants is governed by water potential (the free energy of water). In plants,
water potential is actually a combination of . (1 point).
A. turgor pressure and plant diameter
B. solute concentration and plant height
C. stomatal density and soil porosity
D. solute concentration and soil permeability
E. turgor pressure and solute concentration

6. Stomata function in both water movement and gas exchange. Currently on Earth, both the
atmospheric carbon dioxide level and average surface temperature are increasing. As plants
continue to evolve in this environment, how do you think the density of stomata (= number of
stomata / unit of leaf area) might be affected over time, and why? This is a hypothetical question
with more than one possible answer. (2 points).

Added by Jose Luis H.

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